UL Fuse Classification by Brandy McNeilin Electrical TablesFebruary 16, 2017 Ul Class Fuse Overload Characteristics Interrupting Rating, Amperes AC Voltage Rating Available Ampere Ratings Ferraz-Shawmut Part Number L TIME-DELAY 200,000 600 200 – 6000 601 – 4000 200 – 2000 A4BQ A4BT A4BQ RK1*** TIME-DELAY 200,000 250 600 1/10 – 600 A2D-R A6D-R FAST-ACTING 200,000 250 600 1 – 600 A2K-R A6K-R RK5 TIME-DELAY 200,000 250 600 1/10 – 600 TR-R A2D-R TRS-R A6D-R A6DR IDSR T FAST-ACTING 200,000 300 600 1 – 1200 1 – 1200 A3T A6T J TIME-DELAY 200,000 600 1 – 600 AJT FAST-ACTING 200,000 600 1 – 600 A4J CC TIME-DELAY 200,000 600 1/10 – 30 1/4 – 30 ATQR ATDR FAST-ACTING 200,000 600 1/10 ATMR CD TIME-DELAY 200,000 600 35 – 60 ATDR G TIME-DELAY 100,000 480 1/2 – 60 AG K5 FAST-ACTING 50,000 250 600 1 – 600 OT OTS H Renewable Fuses Fast-Acting 10,000 250 600 1 – 600 RF RFS